[PATCH] Teach ScalarEvolution to sharpen range information.

Sanjoy Das sanjoy at playingwithpointers.com
Mon Oct 20 18:47:29 PDT 2014


The bug was that the code in the `switch...case` invoking `isImpliedCondOperands` assumed `Min` was the unsharpened minimum. This version of the patch fixes the issue and adds a regression test that would've caught the bug.

The earlier patch was also needlessly complex -- I've simplified the code structure in this revision.

Sorry for the confusion!

http://reviews.llvm.org/D5639

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Transforms/IndVarSimplify/sharpen-range.ll
  test/Transforms/IndVarSimplify/widen-loop-comp.ll
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